ZHCSN38D October 2021 – April 2024 LMR54406 , LMR54410
PRODUCTION DATA
- 1
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Device Comparison Table
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Application and Implementation
- 9 Device and Documentation Support
- 10Revision History
- 11Mechanical, Packaging, and Orderable Information
封裝選項
機械數(shù)據(jù) (封裝 | 引腳)
- DBV|6
散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)
訂購信息
7.3.3 Enable
The voltage on the EN pin controls the ON/OFF operation of the LMR544xx. A voltage of less than 0.95 V shuts down the device, while a voltage of greater than 1.36 V is required to start the converter. The EN pin is an input and cannot be left open or floating. The simplest way to enable the operation of the LMR544xx is to connect EN to VIN. This allows self-start-up of the LMR544xx when VIN is within the operating range.
Many applications benefit from the employment of an enable divider, RENT and RENB (Figure 7-3) to establish a precision system UVLO level for the converter. A system UVLO can be used for supplies operating from utility power as well as battery power. It can be used for sequencing, ensuring reliable operation, or supplying protection, such as a battery discharge level. An external logic signal can also be used to drive the EN input for system sequencing and protection.
Figure 7-3 System UVLO by Enable Divider